Wiktionary
progoitrin
n. (context organic compound English) A glycoside of ''1,5-vinyl-2-thiooxazolidone'' present in the foliage of brassicas
Wikipedia
Progoitrin
Progoitrin is a biochemical from the glucosinolate family that is found in some food, which is inactive but after ingestion is converted to goitrin. Goitrin decrease the thyroid hormone production.
Progoitrin has been isolated in cabbage, brussels sprouts, kale, peanuts, mustard, rutabaga, kohlrabi, spinach, cauliflower, horseradish, and oil-seed rape.